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Submitted by:
Shuvo saha roy
Dept: EEE,KUET
Roll: 10030008
A Seminar
on
“Cuckoo Search for Solving Economic
Dispatch Load
Problem”
Contents
 Economic Load Dispatch (ELD)
 Methods For Solving Economic Load Dispatch problem
 Why we use Cuckoo Search?
 Cuckoo Search (CS)
 Formulation of Economic Load Dispatch(ELD)
 Formulation of Cuckoo Search (CS)
 Experimental Testing
 Comparison results between swarm intelligence system
 Comparison Between Three (3) & Six (6) Generating Unit Systems
 Advantage of Cuckoo search (CS)
Economic Load Dispatch (ELD)
• Economic Load Dispatch (ELD) is a process of scheduling the required load demand among available generation
units such that the fuel cost of operation is minimized.
• It is considered as a nonlinear constrained optimization problem with both equality and inequality constraints
• The basic objective of the economic load dispatch problem of electrical power generation is the scaling of
committed generating units outputs to find the consumer load demand at a minimal operating cost within a time
interval
• It is a multi-objective mathematical programming problem, where the goal is to minimize the function that
determines ----
 fuel cost
stating an optimal generation profile
satisfaction of the energy load power
Methods For Solving Economic Load
Dispatch problem
There are several population based methods for computing Economic Load Dispatch
(ELD) -
• Particle Swarm Optimization (PSO) ,
• Shuffled Frog Leaping Algorithm (SFLA),
• Bacterial Foraging Optimization (BFO),
• Artificial Bee Colony (ABC),
• Harmony Search (HS),
• Firefly Algorithm (FA) &
• Cuckoo Search (CS)
Why we use Cuckoo Search?
The main purpose of population-based algorithm is due to two primary
reasons-
• Superior performance of it’s algorithm in contrast with others metaheuristics
(methods)
• Fine balance of randomization and intensification And less number of
control parameters.
Cuckoo Search (CS)
• Cuckoo search (CS) is inspired by some species of a bird family called cuckoo because of
their special lifestyle and aggressive reproduction strategy.
• This algorithm was proposed by Yang and Deb. The CS is an optimization algorithm based
on the brood parasitism of cuckoo species by laying their eggs in the communal nests of
other host birds, though they may remove others’ eggs to increase the hatching probability
of their own eggs.
• Some host birds do not behave friendly against intruders and engage in direct conflict with
them. If a host bird discovers the eggs are not their own, it will either throw these foreign
eggs away or simply abandon its nest and build a new nest elsewhere.
• There are just two parameters to be fine-tuned in CS algorithm: population size and
discovery probability (pa). The CS convergence rate is insensitive to the parameter pa.
Formulation of Economic Load Dispatch(ELD)
• ELD is a multi-objective mathematical programming problem, which consists of minimizing the function that determines
the fuel cost (objective function),
 finding an optimal generation profile, subject to satisfy the load power and
 the technical limits of operation of the groups.
 The total fuel cost for power generation to be minimized is the sum of contributions of each generating units, which is given by:
where, Fi is the fuel cost function for the generation unit i (in $/h) and Pi (in MW) is the real power output for this unit.
 The fuel cost characteristics of each generation unit i is represented by a quadratic equation:
Subjected to:
where: ai, bi and ci are the fuel cost coefficients of the unit i, and Pi(min) and Pi(max) are the minimum and maximum generation
limits of the real power of unit i (in MW).
 The total generated power by the units must be equal to the sum of total load demand and total real power loss
in the transmission lines, as follows:
Continued…
Where, PD is the total system real power demand (in MW); PL is the overall system real power losses (in
MW).
 In the methodology of constant loss formula coefficients (loss coefficient method) or B-coefficients, the
network losses are expressed as a quadratic function of the generators power outputs that can be approximated
in the form:
Where, Bij are the elements of loss coefficient square matrix B, Bi0 is the i-th elements of the loss coefficient
vector and B00 is the loss coefficient constant.
Formulation of Cuckoo Search (CS)
 In the simplest form, each nest has one egg. When generating new solutions x(t+1) for, say cuckoo i,
a Lévy flight is performed:
where  > 0 is the step size which should be related to the scales of the problem of interest. In most cases,
we can use  = O (1). The product  means entry-wise multiplications.
 Lévy flights essentially provide a random walk while their random steps are drawn from a Lévy distribution for
large steps:
which has an infinite variance with an infinite mean.
Experimental Testing Systems
Case 1: Three-Generating Unit System
Case 2: Six-Generating Unit System
Comparison
Comparison Between Three (3) & Six (6)
Generating Unit Systems
Advantage of CS
• The main advantage of Cuckoo Search is a good ability for finding the solution.
• From the results obtained it can be concluded that Cuckoo Search is a competitive
technique for solving complex non smooth optimization problems in power system
operation.
• Cuckoo Search is easy to implement and capable of finding feasible near global optimal
solution.
• CS approach performed better than the ABC and FA methods in terms of reducing the
power transmission losses in 6 generating units system, while FA did not satisfy the power
balance equality constraint.
Conclusion
• Cuckoo Search is easy to implement and capable of finding feasible near global
optimal solution
• Cuckoo Search is proposed for solving economic load dispatch problems.The
effectiveness of this algorithm is demonstrated for test cases consisting of three
and six-generating units.
• After contrasting the simulation results with the other algorithms, it is obviously
seen that Cuckoo Search gives better results than other algorithms.
THANK YOU ALL

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pppmmm-150803200329-lva1-app6892.pdf

  • 1. Submitted by: Shuvo saha roy Dept: EEE,KUET Roll: 10030008 A Seminar on “Cuckoo Search for Solving Economic Dispatch Load Problem”
  • 2. Contents  Economic Load Dispatch (ELD)  Methods For Solving Economic Load Dispatch problem  Why we use Cuckoo Search?  Cuckoo Search (CS)  Formulation of Economic Load Dispatch(ELD)  Formulation of Cuckoo Search (CS)  Experimental Testing  Comparison results between swarm intelligence system  Comparison Between Three (3) & Six (6) Generating Unit Systems  Advantage of Cuckoo search (CS)
  • 3. Economic Load Dispatch (ELD) • Economic Load Dispatch (ELD) is a process of scheduling the required load demand among available generation units such that the fuel cost of operation is minimized. • It is considered as a nonlinear constrained optimization problem with both equality and inequality constraints • The basic objective of the economic load dispatch problem of electrical power generation is the scaling of committed generating units outputs to find the consumer load demand at a minimal operating cost within a time interval • It is a multi-objective mathematical programming problem, where the goal is to minimize the function that determines ----  fuel cost stating an optimal generation profile satisfaction of the energy load power
  • 4. Methods For Solving Economic Load Dispatch problem There are several population based methods for computing Economic Load Dispatch (ELD) - • Particle Swarm Optimization (PSO) , • Shuffled Frog Leaping Algorithm (SFLA), • Bacterial Foraging Optimization (BFO), • Artificial Bee Colony (ABC), • Harmony Search (HS), • Firefly Algorithm (FA) & • Cuckoo Search (CS)
  • 5. Why we use Cuckoo Search? The main purpose of population-based algorithm is due to two primary reasons- • Superior performance of it’s algorithm in contrast with others metaheuristics (methods) • Fine balance of randomization and intensification And less number of control parameters.
  • 6. Cuckoo Search (CS) • Cuckoo search (CS) is inspired by some species of a bird family called cuckoo because of their special lifestyle and aggressive reproduction strategy. • This algorithm was proposed by Yang and Deb. The CS is an optimization algorithm based on the brood parasitism of cuckoo species by laying their eggs in the communal nests of other host birds, though they may remove others’ eggs to increase the hatching probability of their own eggs. • Some host birds do not behave friendly against intruders and engage in direct conflict with them. If a host bird discovers the eggs are not their own, it will either throw these foreign eggs away or simply abandon its nest and build a new nest elsewhere. • There are just two parameters to be fine-tuned in CS algorithm: population size and discovery probability (pa). The CS convergence rate is insensitive to the parameter pa.
  • 7. Formulation of Economic Load Dispatch(ELD) • ELD is a multi-objective mathematical programming problem, which consists of minimizing the function that determines the fuel cost (objective function),  finding an optimal generation profile, subject to satisfy the load power and  the technical limits of operation of the groups.  The total fuel cost for power generation to be minimized is the sum of contributions of each generating units, which is given by: where, Fi is the fuel cost function for the generation unit i (in $/h) and Pi (in MW) is the real power output for this unit.  The fuel cost characteristics of each generation unit i is represented by a quadratic equation: Subjected to: where: ai, bi and ci are the fuel cost coefficients of the unit i, and Pi(min) and Pi(max) are the minimum and maximum generation limits of the real power of unit i (in MW).
  • 8.  The total generated power by the units must be equal to the sum of total load demand and total real power loss in the transmission lines, as follows: Continued… Where, PD is the total system real power demand (in MW); PL is the overall system real power losses (in MW).  In the methodology of constant loss formula coefficients (loss coefficient method) or B-coefficients, the network losses are expressed as a quadratic function of the generators power outputs that can be approximated in the form: Where, Bij are the elements of loss coefficient square matrix B, Bi0 is the i-th elements of the loss coefficient vector and B00 is the loss coefficient constant.
  • 9. Formulation of Cuckoo Search (CS)  In the simplest form, each nest has one egg. When generating new solutions x(t+1) for, say cuckoo i, a Lévy flight is performed: where  > 0 is the step size which should be related to the scales of the problem of interest. In most cases, we can use  = O (1). The product  means entry-wise multiplications.  Lévy flights essentially provide a random walk while their random steps are drawn from a Lévy distribution for large steps: which has an infinite variance with an infinite mean.
  • 10. Experimental Testing Systems Case 1: Three-Generating Unit System
  • 11. Case 2: Six-Generating Unit System
  • 13. Comparison Between Three (3) & Six (6) Generating Unit Systems
  • 14. Advantage of CS • The main advantage of Cuckoo Search is a good ability for finding the solution. • From the results obtained it can be concluded that Cuckoo Search is a competitive technique for solving complex non smooth optimization problems in power system operation. • Cuckoo Search is easy to implement and capable of finding feasible near global optimal solution. • CS approach performed better than the ABC and FA methods in terms of reducing the power transmission losses in 6 generating units system, while FA did not satisfy the power balance equality constraint.
  • 15. Conclusion • Cuckoo Search is easy to implement and capable of finding feasible near global optimal solution • Cuckoo Search is proposed for solving economic load dispatch problems.The effectiveness of this algorithm is demonstrated for test cases consisting of three and six-generating units. • After contrasting the simulation results with the other algorithms, it is obviously seen that Cuckoo Search gives better results than other algorithms.